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Tough weekend at Memphis, after qualifying 14th, raced up to 11th after the first 100 laps, but noticed a slight miss in the motor. Changed 4 tires during the first break, noticed a couple of plug wire boots cracked. We repaired the boots, and thought that would take care of the problem only to have the engine miss return and become worse after the half way point of the race. Really struggled throughout the rest of the second 100 segment. After the start of the final 100 lap leg of the race, the engine shut off at 207 laps, regulating to a 22nd place finish.